Preheat oven to 400°. Set each potato in a large spoon & make thin slices along length of potato - use spoon as guide so you don’t cut all the way through potato. In a large bowl, toss potatoes liberally in the olive oil, making sure to get it in between slices. Arrange potatoes on a foil lined baking sheet, cut side up. Sprinkle with salt & pepper to taste, making sure to season in between the slices.